"In the midst of the great mantle of drift that overspreads the Upper Mississippi Basin there lies a drift-barren tract of about 10,000 square miles, the driftless area of Wisconsin and adjoining States. This island in the sea of drift is unique..." pp. 199-322. 6 plate maps, 5 are in color, some double-spread and one foldout. Numerous engravings. Disbound from The U.S. Geological Survey. Top page edge with black marking?- partially stamped? "Bound" in paper wraps with tissue guards at front and back. Very Good + condition. No tears. Interior is tight, clean and Very Good+. Thomas Chrowder Chamberlin (September 25, 1843 - November 15, 1928) was an influential American geologist and educator.